To　realize　net-based　real-time　communication　and　long　distance　diagnose,　an　embedded　main　architecture　of　real-time　data　acquisition　and　signal　processing　system　based　on　TCP/IP　is　proposed　and　analyzed.　And　design　and　realization　of　the　data　communication　system,　which　is　based　on　Internet/Intranets　including　master　CPU　(ARM)　of　net　managing,　slave　CPU　(DSP)　of　data　processing　and　their　interface　both　in　software　and　hardware　are　also　presented.　By　using　ARM　and　DSP　master-slave　system,　embedded　LINUX　OS　and　reasonable　multi-task-assigned　mechanism,　the　demand　for　real-time　and　data　communication　speed　of　network　are　guaranteed.